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\(-23\cdot63+23\cdot21-58\cdot23\)
\(=23\left(-63+21-58\right)\)
\(=23\cdot\left(-100\right)\)
\(=-2300\)
![](https://rs.olm.vn/images/avt/0.png?1311)
-23.63+23.21-58.23
=23(-63+21-58)
=23.(-100)
=-23000
![](https://rs.olm.vn/images/avt/0.png?1311)
có 2 cách dùng cách 2 cho nhanh :(19/23-42/23) :(17/49:17/49)+3/7
=-1.19/49+3/7
=-19/49+21/49=2/49
![](https://rs.olm.vn/images/avt/0.png?1311)
-23.63+23.21-58.23
=23.(-63)+23.21-58.23
=23.(21-63-58)
=23.(-100)
=-2300
![](https://rs.olm.vn/images/avt/0.png?1311)
(-23).63 + 23.21 - 58.23
= 23.(-63 + 21 - 58)
= 23 . (-100)
= -2300
( - 23 ) . 63 + 23 . 21 - 58 . 23
= 23 . ( - 63 + 21 - 58 )
= 23 . ( - 100 )
= - 2300
![](https://rs.olm.vn/images/avt/0.png?1311)
a: \(-81\cdot36+\left(-81\right)\cdot63-81\)
\(=36\cdot\left(-81\right)+63\cdot\left(-81\right)+\left(-81\right)\)
\(=-81\left(36+63+1\right)\)
\(=-81\cdot100=-8100\)
b: \(23\cdot\left(-38+123\right)-123\cdot\left(23-38\right)\)
\(=-23\cdot38+23\cdot123-123\cdot23+123\cdot38\)
\(=123\cdot38-23\cdot38=38\left(123-23\right)=38\cdot100=3800\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a=73.(34+1+65)=73.100=7300
b=299-6[(12+8):5-3]=299-6.16=299-96=203
23.5 - 23 . 3 + 23 . 88
= 23 . ( 5 - 3 + 88 )
= 23 . ( 2 + 88 )
= 23 . 90
= 8 . 90
= 720
\(2^3\times5-2^3\times3+2^3\times88\)
\(=2^3\left(5-2+88\right)\)
\(=8\times91\)
\(=728\)